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Put it in warm water, after a while, if its colour disappears it's fake, if not it's real. This is because gold does not react with water. but golden coating reacts with water.

You could always use the same method that Archimedes used. He measured the displacement of the water when the crown was submerged as well as the weight to determine the density of the crown. He then compared the crown's density to a pure gold reference density. If the densities matched, then they were both of the same purity of gold.

Note: Gold's density is 19.3 g/cm**3

edit:

Density can be measured (as mentioned above). Melting temperature is also a good indicator of purity (if you're willing to part with the gold's form).

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